It's difficult to say for certain why your ex is still texting you and talking about your sex life without knowing more details about your specific situation. However, there could be a few possible reasons:
Emotional Attachment: Your ex may still have emotional feelings for you and find it challenging to completely let go. They might be reminiscing about your past relationship and trying to maintain a connection, even if it's not healthy or appropriate.
Desire for Intimacy: Discussing your past sex life could be a way for your ex to feel a sense of intimacy or closeness with you. They may miss the physical aspect of your relationship and are seeking emotional comfort through these conversations.
Lack of Closure: Sometimes, when a relationship ends abruptly or without proper closure, one or both partners may struggle to move on. Talking about your shared experiences, including your sex life, might be their way of processing the breakup or seeking closure.
Manipulation: In some cases, an ex might bring up intimate topics to manipulate or control you emotionally. They could be attempting to evoke certain feelings or behaviors from you, which could lead to confusion and keep you entangled in the past.
Insecurity or Validation: Discussing your sex life might be a way for your ex to seek validation or reassurance about themselves or their sexual abilities. They may be trying to gauge whether you still find them attractive or desirable.
Regardless of the reasons behind their behavior, it's essential to set clear boundaries with your ex. If these conversations make you uncomfortable or hinder your ability to move on, you should communicate your feelings to them. If they continue to engage in such discussions despite your objections, it might be necessary to limit or cut off contact with them to prioritize your emotional well-being.
Remember, it's perfectly acceptable to prioritize your own happiness and emotional health, even if it means distancing yourself from someone you once cared about deeply.